PMID: 11336917May 5, 2001Paper

Osteoprotegerin inhibits osteoclast formation and bone resorbing activity in giant cell tumors of bone

Bone
G J AtkinsD M Findlay

Abstract

Osteolysis is a common complication of tumors that arise in, or metastasize to, bone. The recent discovery of key regulators of osteoclast formation and activity, including receptor activator of nuclear factor of kappaB ligand (RANKL), RANK, and osteoprotegerin (OPG), may facilitate new treatment regimes for certain tumors associated with excessive bone loss. We recently showed that the stromal cells of osteolytic giant cell tumors (GCT) of bone express high levels of mRNA encoding RANKL, relative to mRNA for the RANKL antagonist, OPG, compared with the expression patterns of other lytic and nonlytic bone tumors. In this study, we found that expression of RANKL and OPG mRNA continued by the stromal element of these tumors in a constitutive manner for at least 9 days in the absence of giant cells. Immunostaining of unfractionated GCT cultured in vitro revealed punctate cytoplasmic/membranous staining for RANKL and both cytoplasmic and extracellular matrix staining for OPG in stromal cells. Giant cells (osteoclasts) were negative for RANKL staining, but stained brightly for cytoplasmic OPG protein. We also investigated the functional relevance of these molecules for GCT osteolysis by adding recombinant OPG and RANKL to cultured G...Continue Reading

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